Oscillatory structure is found in the atomic background absorption in x-ray-absorption fine structure (XAFS). This atomic-XAFS or AXAFS arises from scattering within an embedded atom, and is analogous to the Ramsauer-Townsend effect. Calculations and measurements confirm the existence of AXAFS and show that it can dominate contributions such as multi-electron excitations. The structure is sensitive to chemical effects and thus provides a new probe of bonding and exchange effects on the scattering potential.
@article{arxiv.cond-mat/9401006,
title = {X-ray Absorption Fine Structure in Embedded Atoms},
author = {J. J. Rehr and C. H. Booth and F. Bridges and S. I. Zabinsky},
journal= {arXiv preprint arXiv:cond-mat/9401006},
year = {2009}
}